Order the masses from smallest to largest

Can someone please tell me if this right.

The correct option is 1 signal expected in the proton-decoupled 13C-NMR spectra. The correct option is D.

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Answer:

A mixture of pre- and post-1982 pennies will represent the naturally occurring mixture of two isotopes of an imaginary element

Explanation:

Since 1982, U.S. pennies have been produced with 97.6% zinc with a thin plating of copper. Since each metal has a different density, pre- and post-1982 pennies have different masses.Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and electrons.

Answer:

Explanation:o

Separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. you recover the anthracene would be recovered by the  collecting the top layer, and then dry with Na₂SO₄  and then evaporate the solvent.

The anthracene and the benzoic acid both are acidic so it is not possible to sperate both normally. so,  we would sperate it from ethyl acetate and a basic aqueous solution and then dry it with Na₂SO₄ , so that it can absorbed the benzoic acid.

Thus, Separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. you recover the anthracene would be recovered by the  collecting the top layer, and then dry with Na₂SO₄  and then evaporate the solvent.

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Answer:

A

Explanation:

The molarity of potassium ions in a 0.526 M potassium phosphate solution is 1.58 M, since each formula unit of K3PO4 contains three potassium ions.

Potassium phosphate (K3PO4) dissociates into three potassium ions (K+) and one phosphate ion (PO43-). Therefore, the molarity of potassium ions in a potassium phosphate solution is three times the molarity of the original solution. In this case, the molarity of the potassium phosphate solution is 0.526 M, so the molarity of potassium ions is 3 x 0.526 M = 1.58 M. This calculation is important in determining the concentration of a specific ion in a solution, which is essential in many fields such as biology, chemistry, and environmental science. Knowing the concentration of a specific ion can help predict chemical reactions, study enzyme kinetics, and monitor water quality, among other applications.

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Answer:

Answer:

Explanation:

The wavelength of a wave can be found by using the formula

\(\lambda = \frac{c}{f} \\\)

where

c is the speed of the wave

f is the frequency

From the question

c = 5 m/s

f = 2.5 Hz

We have

\( \lambda = \frac{5}{2.5} = 2 \\ \)

We have the final answer as

Hope this helps you

Answer:

Nervous system directs your body to swear to release heat.

Explanation:

Sweat maintains homeostasis when overheating.

When the body becomes overheated, the nervous system directs your body to sweat to release heat. Cooling effect of sweating over body balance the homeostasis.

Any self-regulating mechanism called homeostasis helps biological systems to maintain stability while responding to environmental factors that are appropriate for survival. If homeostasis is attained, life goes on; if it is not, tragedy or death result.

The stability obtained is actually a dynamic equilibrium, where circumstances are mostly uniform yet change is constant. The ability to regulate their body temperature is a prime example of homeostasis in a biological system.

Humans typically have body temperatures that vary about 37 °C, but a number of variables, such as exposure, hormones, metabolic rate, and sickness, can alter this value and cause abnormally high or low temperatures. The sweating is a good example of homeostasis.

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XY2Z - linear

XY2Z2 - bent(120)

XY2Z3 - bent(109)

XY3Z -  trigonal pyramidal

XY3Z2 - t-shaped

XY4Z -  see-saw

XY4Z2 - square planar

XY5Z - square pyramidal

Linear shape: A linear molecule is one that has its atoms arranged in a straight line.

Bent shape: One type of bent molecular geometry features a center atom with two lone pairs of electrons and two bond pairs attached to it. Other names for it include angular and V-shaped.

Trigonal pyramidal: A trigonal pyramid is a molecular shape that resembles a tetrahedron and has one atom at the top and three at the corners of the base.

T-Shaped: When a central atom has three ligands, the structure of the molecule is said to have a T-shaped molecular geometry.

See-saw: This shape is caused by a lone pair of electrons on the central atom.

Square planar: In square planar molecular geometry, constituent atoms create the square's four corners on the same plane and surround the center atom.

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Answer:

so in one mole of atom there are 6.02×10^23.

answers to B is 2.41×10^24

Explanation:

use this equation

number of particle=moles X 6.02×10^23

=4 X 6.02 ×10^23

=2.41×10^24

hope this make sense:)

The number of particles present in 4 moles of a substance is 24.088 particles.

Moles is a unit to express the amount of any substance and in one mole of any substance 6.022 × 10²³ particles of that substance are present and this number is known as Avogadro's number.

As in 1 mole = 6.022 × 10²³ particles are present

In 4 moles = 4 × 6.022 × 10²³ = 24.088 particles are present

Hence, 24.088 particles are present in 4 moles.

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Answer:

4 Sb, 3 \(O_{2}\)

Explanation:

  On the reactant's side of the equation (the left side), there is one Antimony and one Oxygen gas molecule (\(O_{2}\)). The oxygen gas molecule is made of two atoms, so we actually have 2 oxygens on the left side. On the product's side (the right side), there are 4 antimony atoms, and 6 oxygen atoms. If we were to write it out in a certain way, it would look like this:

__Sb + __ \(O_{2}\) --> \(Sb_{4} O_{6}\)

                  1   Sb   4

                  2   O   6

  To balance this equation, those numbers on either side of the elements must equal each other. We can accomplish this with the proper coefficients. If we put a 4 in front of the antimony, it means this:

4 Sb + __ \(O_{2}\) --> \(Sb_{4} O_{6}\)

                  4   Sb   4

                  2   O   6

And the antimony is now balanced.

  Now we must balance the oxygen. There are 6 oxygens on the product's side but only 2 on the reactant's side. To fix this, simply multiply the oxygen by 3:

4 Sb + 3 \(O_{2}\) --> \(Sb_{4} O_{6}\)

              4   Sb   4

              6   O   6

3 * 2 = 6, so now oxygen is balanced, and the equation is now correct.

Answer:

The crane should have an electromagnet attached to its arm. The electromagnet: should have a soft iron core made from a bundle of short lengths of iron wire, must be strong enough to pick up several steel paperclips, nails or coins. Work on your own. This task will be assessed.

Explanation:

"the number of ions produced by one formula unit of the electrolyte," refers to the van't Hoff factor (i) in an ideal solution of a strong electrolyte. It represents the extent of dissociation of the electrolyte into ions.

In an ideal solution of a strong electrolyte, the van't Hoff factor (i) represents the number of ions that are produced when one formula unit of the electrolyte dissociates completely in the solution. It is a measure of the extent of dissociation of the electrolyte.

For example, for a strong electrolyte such as sodium chloride (NaCl), when it dissolves in water, it completely dissociates into sodium ions (Na+) and chloride ions (Cl-). In this case, the van't Hoff factor (i) would be 2 because one formula unit of NaCl produces two ions (Na+ and Cl-).

Similarly, for other strong electrolytes, the van't Hoff factor (i) can be determined based on the number of ions produced per formula unit. It is important to note that for non-electrolytes or weak electrolytes, the van't Hoff factor (i) is typically less than 1, indicating partial dissociation or no dissociation in the solution.

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Answer:

"the chemical engineering processes and other facilities used in petroleum refineries to transform crude oil into useful products such as liquefied petroleum gas, gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils"

-wikipedia

Explanation:

\(\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}\)

An oil refinery or petroleum refinery is an industrial process plant where crude oil is transformed and refined into useful products such as petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil, kerosene, liquefied petroleum gas, jet fuel and fuel oils.

The amount of radioactivity given off by a typical banana that contains 420 mg of Potassium, due to the presence of the natural isotope of 40 K, is about 15 Bq.

The half-life of 40K is 1.248 x 10⁹ y, which is about 4.5 x 10¹⁶ s. The number of 40K atoms in 420 mg of Potassium is about 1.2 x 10²¹ atoms. The activity of 40K is given by the following equation:

A = λN

where A is the activity, λ is the decay constant, and N is the number of atoms. The decay constant for 40K is 6.30 x 10⁻¹¹ s⁻¹.

Plugging in the values, we get the following:

A = (6.30 x 10⁻¹¹ s⁻¹)(1.2 x 10²¹ atoms) = 7.5 x 10¹⁰ s⁻¹

The activity of 40K is measured in becquerels (Bq), where 1 Bq = 1 decay per second. So, the activity of 40K in a typical banana is about 15 Bq.

It is important to note that the amount of radioactivity given off by a banana is very small. The average person is exposed to about 300 mSv of radiation per year from natural sources, such as radon gas, cosmic rays, and the food we eat.

The amount of radiation given off by a banana is about 0.000005 mSv, which is about 0.0002% of the average annual exposure from natural sources. So, eating a banana will not increase your risk of radiation exposure.

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Complete question :

What is the amount of radioactivity given off by a typical banana that contains 420 mg of Potassium, due to the presence of the natural isotope of 40 K? which has a half-life of 1.248 x 10⁹ y and is 0.0117% of all Potassium. Atomic mass of K is 39.0983 g and A = 6.023 x 10 23 atoms

Answer:

Electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard light microscopes.

Explanation:

Explanation:

In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster.

The first shell of an atom is its electron shell, or energy level.

The subshell is the second shell.

The particular orbital (or "cloud") within that subshell is the third shell.

The position and energy of an electron in an atom are represented by a set of numbers known as quantum numbers.

principal quantum number

azimuthal quantum number

magnetic quantum number

The electron shell, also known as the atom's energy level, is the initial shell. The value of N ranges from 1 to the atom's outermost electron's shell.

By using the connection, the second shell, which is the subshell, determines the magnitude of the orbital angular momentum.

The third shell creates the orbital angular projection momentum along a certain axis and is the particular orbital (or "cloud") within that subshell.

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Cohesion in water refers to the attractive forces between water molecules. This is due to the presence of hydrogen bonds between the molecules, which are formed by the partial positive charge on the hydrogen atoms of one molecule and the partial negative charge on the oxygen atoms of another molecule.

Cohesion is important in water because it allows for the surface tension of water, which is the resistance of the surface of a liquid to breaking when a force is applied to it. This is why water droplets form spheres and why insects can walk on water.

Cohesion also contributes to the high heat of vaporization of water.

This is the amount of energy required to turn liquid water into water vapor. Because of the strong hydrogen bonds between water molecules, a lot of energy is required to break them and turn water into a gas, which is why it takes a lot of energy to boil water.

This property of water also contributes to the moderation of temperatures on earth, as it takes a lot of energy to turn liquid water into water vapor, and this process cools the surface of the earth.

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Answer:

f = frequency = 590,000 Hz ===> 59×10^4 Hz

λ = Wavelength = ?

c = Speed of light in a vacuum = 3 × 10^8 m/s

** Hz = 1/sec

___o___o___

\(f = \frac{c}{λ} \\ \\ λ = \frac{c}{f} \\ \\ λ = \frac{3 \times {10}^{8} }{590000} \\ \\ λ = \frac{3 \times {10}^{8} }{59 \times {10}^{4} } \\ \\ λ =0.0508 \times {10}^{4} \: m \\ \\ λ = 508 \times {10}^{ - 4} \times {10}^{4} \: m \\ \\ λ = 508 \: m\)

I hope I helped you^_^

Here is a list of some renewable resources, I hope these help answer the question, or help to answer it.

-ethanol

-hydropower

-geothermal power

-wind energy

-solar energy

-biomass

(Biomass refers to organic material from plants and animals)

Wind, forest, tides and geothermal energy are the resouces of renewable energy.

Renewable resources are energy sources that never run out and can provide a steady supply of clean energy.

Hence resouces of renewable energy are wind, forest, tides and geothermal energy.

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Answer:

it's A

Explanation:

100 on test5tttttttttttttttt

Answer:

Diffusion helps cells maintain homeostasis by allowing ions to move across the cell membrane to maintaing both the voltage across the membrane and the ion concentrations.

Diffusion helps in maintaining homeostasis by allowing movement of ions in and out across the cell.

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive  movement of molecules across cell  membrane  from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

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The balanced equation shows that 6 electrons are transferred in this reaction. Answer: 6 electrons.

To balance the given redox reaction in acidic conditions:

FeO(aq) + V2O5(aq) → Fe2O3(aq) + VO(aq)

First, balance the atoms other than oxygen and hydrogen:

FeO(aq) + V2O5(aq) → 2Fe2O3(aq) + VO(aq)

Next, balance the oxygen atoms by adding water molecules:

FeO(aq) + V2O5(aq) → 2Fe2O3(aq) + VO(aq) + H2O(l)

Now, balance the hydrogen atoms by adding hydrogen ions (H+):

FeO(aq) + V2O5(aq) + 7H+ → 2Fe2O3(aq) + VO(aq) + H2O(l)

Finally, balance the charges by adding electrons (e-):

FeO(aq) + V2O5(aq) + 7H+ + 6e- → 2Fe2O3(aq) + VO(aq) + H2O(l)

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The electronic configuration of the element Sb (antimony) can be determined by referring to the periodic table. Antimony has an atomic number of 51, which means it has 51 electrons.

Writing out the electronic configuration using superscript with the orbital:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p³

Writing out the electronic configuration using noble gas notation:

[Noble Gas] 5s² 4d¹⁰ 5p³

The noble gas notation allows us to use the symbol of the noble gas element that comes before the element of interest in the periodic table. In the case of Sb, the noble gas that comes before it is Kr (krypton), which has the electronic configuration [Kr] 5s² 4d¹⁰. Therefore, we can replace [Kr] with its electronic configuration and continue with the remaining electrons.

Ranking the atoms in each group in order of increasing size:

a. beryllium < boron < neon

b. nitrogen < phosphorus < arsenic

c. argon < phosphorus < chlorine

The size of an atom is determined by its atomic radius, which generally increases as you move down a group in the periodic table and decreases as you move across a period from left to right.

Identifying the element from which it is easier to remove an electron:

a. lithium (Li) is easier to remove an electron compared to beryllium (Be)

b. fluorine (F) is easier to remove an electron compared to oxygen (O)

c. neon (Ne) is easier to remove an electron compared to krypton (Kr)

d. phosphorus (P) is easier to remove an electron compared to gallium (Ga)

The ease of removing an electron, or ionization energy, generally decreases as you move down a group and increases as you move across a period in the periodic table.

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The beast method to get the final volume and concentration as needed is dilution calculations.

Dilution is the best method which we are used to determine the volume and concentration in through experiment . diluted solution must contain some undissolved particles of solute or moles of solute.

Concentration of dilute is measure the mass of solute in 1L of solution. We can be determine concentration of solution by using molality os solution. moles of solute remain constant in dilute solution this implies concentration of solution decrease with incerease the volume of solution.

Molality is defined as mass of solute (kg) to the mass of solvent .

initial volume of solution = 10ml

initial molality = 4.6 m

but we need final volume = 10 ml and molality 0.00046 m. The dilution concentration allows a formula , C₁× V₁ = C₂ × V₂where , C₁×V₁ is moles of solute in initial soltion and C₂× V₂ is moles of solute in dilute solution.

with the help of above formula we can easily determine the value of concerntrat ion and volume of dilute solution.

For getting the final volume we can do the experiment basec on dilution in which we use graduated cylinder for measuring volume and 1.00 ml volmetric pipette and dilute the solution with 10ml. Also , use 10ml volmetric pipette to add all solution to 90 ml of water.

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